The pulse frequency noise of magnetars and persistent accretion powered pulsars

Serim, Danjela
In this thesis, the pulse frequency fluctuations of magnetars and six selected persis-tent accreting powered pulsars (PAPPs) are presented. Using the data fromRXTE,XMM-Newton, Chandra, SwiftandFERMIobservatories, the timing noise behav-ior of individual sources on various timescales are examined, depending on the datasampling rate of input frequency measurements. The timing noise amplitudes are an-alyzed via two separate methods, namely∆8andr.m.smethods. The timing noisecharacteristics of both magnetars and PAPPs are investigated together with a sampleof 366 radio pulsars obtained from literature. The relations of timing noise behaviorwith the physical quantities are examined with an aim of exploring the origin of thenoise process in different source samples. The focus of the study is to understand thetiming noise behavior of magnetars and accretion powered pulsars. The results showthat there is a connection between timing noise behavior of magnetars and radio pul-sars, in fact they form a continuum. Furthermore, the timing noise in magnetars donot exhibit footprints of accretion. On the other hand, PAPs display a rather distinc-tive timing behavior that is induced by inhomogeneities in the accretion flow. Hence,the results of this study suggests that timing noise of magnetars originate from the extreme magnetic field strengths and outburst activities.


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Pulse frequencies from the archival ROSAT observations of 1E 2259+586 are presented. A short-term spin-up episode superposed on the secular spin-down trend is observed. Combining the previously published pulse frequencies, we estimate the variance of the angular velocity over a 15 yr span of observations. The level of fluctuations in angular velocity is similar to that of established accreting binary neutron stars. These results favor accretion by a neutron star from a very low mass companion as the source ...
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Guseinov, OH; Yazgan, E; Tagieva, SO; Ozkan, S (2003-10-01)
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Recent Spin Rate Measurements of 4U 1907+09
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The Spectral and temporal properties of MAXI J1409-619
Dönmez, Çağatay Kerem; Baykal, Altan; Department of Physics (2019)
In this thesis, spectral and timing analysis of the transient high-mass X-ray binary (HMXB) pulsar MAXI J1409-619 are presented. MAXI J1409-619 was discovered in October 2010, and went into an outburst in early December 2010 until February 2011. Observations of Swift and RXTE throughout this period are used in the thesis. The analysis results are in line with the assertion that MAXI J1409-619 is an accretion-powered pulsar. Time-resolved energy spectra of RXTE and Swift data confirm the previously reported ...
Citation Formats
D. Serim, “The pulse frequency noise of magnetars and persistent accretion powered pulsars,” Ph.D. - Doctoral Program, Middle East Technical University, 2021.